Check Engine Light With Code P0171 and/or P0174 on Pontiac Grand Prix

The exhaust gas recirculation (EGR) tube which connects the EGR valve to the intake manifold may develop an engine vacuum leak, causing the Check Engine Light to illuminate with code P0171 and/or P0174 stored.

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Average mileage: 141,000 (103,000–170,000)
Exhaust & Emissions affected: 3.8L V6
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2005
14 people reported this problem
2 people shared problem details
Had check engine light on code p171 and replaced all filters sensors did smoke test for leaks and leak test, egr etc. nothing seems to keep it off it keeps coming back it will stay on and it will go off by itself sometimes I don't know what else to try
Yes I just had it hooked up to see why my engine light came on and it was the ETR, I am beginning to believe the car is like my old FORD FIX ON ROAD DAILY>
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